Here's how I see it. It doesn't make sense to solder two connectors onto to pairs of wires so that you can have a contact connection when it would me quicker, cheaper and better to solder the wires together directly. Even if you were planning on replacing the battery later, you'd still need to solder on a connector, which is the same work as soldering the wires together.
Just to make it clear, although I said battery wires, I mean the wires on the battery base/receiver thing. The battery just clips in or out.